33282-15-4, Name is 5-(4-Hydroxyphenyl)isoxazole-3-carboxylic acid, belongs to isoxazole compound, is a common compound. Product Details of 33282-15-4In an article, once mentioned the new application about 33282-15-4.
Diazoanilides of type 4 were found to undergo Nafion-H catalysed cyclization onto the aromatic ring and concomitant decarboxylation, under optimal conditions, to give 3-unsubstituted 2-indolinones 5 in moderate yields.Diazoanilides that possess electron-donating substituents in the aromatic moiety gave higher yields of 5 and, in one case, the presence of an electron-withdrawing group in the aromatic moiety did not impede the cyclization.In the case of the diazoanilides that possess a N-butenyl group, preferential 1,3-dipolar cycloaddition of the diazo unit onto the butenyl double bond occurred to give an unstable 1-pyrazoline which was converted, by loss of nitrogen accompanied by hydrogen migration, to dihydro-2-pyridinone derivatives.It was also found that substituents ortho to the amido group and/or the site of cyclization sterically retarded the cyclization.
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Reference：
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem